We are now short fresh water. Something must be done to prevent peoplepolluting it.A. of；f

问题补充：

We are now short fresh water. Something must be done to prevent peoplepolluting it.

A. of；from B. for；from C. of；to

答案：

解析：句意:我们现在缺乏新鲜的水。必须做点什么来防止人们污染它。第一个空是一个固定的短语，be short of 短缺……；第二个空也是一个句型，prevent sb. from doing sth. 意为：阻止某人做某事。故选A。